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Issue 24, 2017
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Anisotropic longitudinal electronic relaxation affects DNP at cryogenic temperatures

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Abstract

We report the observation of anisotropic longitudinal electronic relaxation in nitroxide radicals under typical dynamic nuclear polarization conditions. This anisotropy affects the efficiency of dynamic nuclear polarization at cryogenic temperatures of 4 K and high magnetic fields of 6.7 T. Under our experimental conditions, the electron paramagnetic resonance spectrum of nitroxides such as TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl) is only partly averaged by electronic spectral diffusion, so that the relaxation times T1e(ω) vary across the spectrum. We demonstrate how the anisotropy of T1e(ω) can be taken into account in simple DNP models.

Graphical abstract: Anisotropic longitudinal electronic relaxation affects DNP at cryogenic temperatures

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Publication details

The article was received on 16 May 2017, accepted on 02 Jun 2017 and first published on 09 Jun 2017


Article type: Paper
DOI: 10.1039/C7CP03242K
Citation: Phys. Chem. Chem. Phys., 2017,19, 16087-16094
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    Anisotropic longitudinal electronic relaxation affects DNP at cryogenic temperatures

    E. M. M. Weber, H. Vezin, J. G. Kempf, G. Bodenhausen, D. Abergél and D. Kurzbach, Phys. Chem. Chem. Phys., 2017, 19, 16087
    DOI: 10.1039/C7CP03242K

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